Your Watch’s VO2max Is Lying to You — But That Might Be Okay

If you wear a Garmin, Apple Watch, Fitbit, or Whoop, there’s a good chance you’ve glanced at its VO2max estimate and either felt smug or slightly insulted. That number — the gold-standard measure of cardiorespiratory fitness — has become one of the most prominent metrics on the consumer wrist. Here’s the uncomfortable truth from the […]